CN1753555A - Base station controller migration method undur separation state - Google Patents
Base station controller migration method undur separation state Download PDFInfo
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- CN1753555A CN1753555A CN 200410080102 CN200410080102A CN1753555A CN 1753555 A CN1753555 A CN 1753555A CN 200410080102 CN200410080102 CN 200410080102 CN 200410080102 A CN200410080102 A CN 200410080102A CN 1753555 A CN1753555 A CN 1753555A
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Abstract
This invention provides a migration method for a base station controller (RNC) at the separated state, in which, the area switched by a UE attributes to a target RNC (TRNC), when a service RNC (SRNC) is judged to be at the separation state, the method includes the following steps: A, judging if the service used by said UE currently contains the real time service, if so, the time delay limit value of QoS corresponding to said real time service is got to carry out the next step, otherwise, migration is refused and the flow is ended, B, obtaining the actual transmission time delay from SRNC to the UE, C, judging if the actual transmission time delay is larger than the real time service QoS time delay limit value, if so, the migration is started, otherwise the migration is refused and the flow is ended.
Description
Technical field
The present invention relates to the handoff technique field of cell mobile communication systems, be meant a kind of base station controller (RNC) moving method under released state especially.
Background technology
CDMA is a kind of spread spectrum technic.The typical networking mode of current C DMA system as shown in Figure 1 comprises: core net (CN, Core Network), base station controller (RNC), base station (NodeB), user terminal (UE, User Equipment).Link to each other by the Iu interface between CN and the RNC, link to each other by the Iur interface between the RNC, link to each other by Iub interface between RNC and the NodeB, link to each other by the Uu interface between NodeB and the UE, above-described interface is the standard interface of the opening of stipulating in the CDMA agreement.
In the existing cell mobile communication systems, for the utilance that improves frequency spectrum resource and the capacity of whole system, make that the radio-frequency power of base station is confined to certain scope in the system, this scope is the sub-district.Enter the another one sub-district when travelling carriage (being UE in cdma network) leaves a sub-district, the signal of the original sub-district that this travelling carriage is received inevitable more and more a little less than, and its received signal that enters the sub-district will be more and more stronger just also.In order to keep the communication quality of travelling carriage, must switch to the stronger sub-district of signal that newly enters by original sub-district to continuing of this travelling carriage, the notion of switching in Here it is the cell mobile communication systems.
As shown in Figure 1, switch owing to exist, when the user gradually away from belonging to serving BS controller (SRNC, Serving RNC) sub-district under the NodeB, to belonging to migration base station controller (DRNC, when move the sub-district under NodeB Drifting RNC), the situation that may occur is: all belong to DRNC with all base stations of telex network, but this moment, data and signaling-information were not sent to core net by DRNC, and still be transferred to SRNC by the Iur interface between DRNC and the SRNC, be transferred to core net by SRNC then, this situation that will occur here is called released state.When released state occurring,, can cause the waste of Iur interface transfer resource between the RNC because the informational needs of UE is sent to core net by SRNC is circuitous, and long propagation delay time.Wherein DRNC also can be called target base station controller (TRNC, Target RNC).
When described released state judge to appear in SRNC, usually will start the migration of RNC, promptly by a series of signaling process, finally reach and make TRNC fulfil the responsibility of former SRNC equally, and that sets up TRNC and core net passes through communicating by letter of Iu interface, and the Iu interface transfer resource of the transfer resource of the Iur interface of former SRNC and TRNC, former SRNC and core net will be released.Like this, information transmission path does not need to stride a plurality of RNC, and directly is transferred to core net by TRNC, saved processing delay that a plurality of RNC produce and between propagation delay time, reduced user's service delay.
But, because in the prior art, when described released state judge to appear in SRNC, or start the migration of RNC at once, or do not move.If migration in some cases, can cause damage to the current business of using of user immediately, for example can produce the hit of user's communication etc.On the other hand,,, frequent migration can occur between two NodeB shown in Fig. 1, not only user's current business be caused damage, also certainly will increase the weight of the signaling traffic load of RNC when the user comes and goes when mobile because migration itself has brought the load of signaling.
On the other hand, if can not move timely, then can bring the shortcoming of service delay again, has the real time business of specific QoS propagation delay time restriction for some, for propagation delay time different limited fields is arranged, surpass this QoS time delay requirement for restriction, can reduce QoS of survice equally.
Summary of the invention
In view of this, main purpose of the present invention be to provide a kind of under released state the moving method of RNC, make guaranteeing to reduce the startup of RNC migration under the professional QoS delay requirement as far as possible.
Realize a kind of base station controller RNC moving method under released state provided by the invention, belong to target base station controller TRNC in the sub-district that user terminal UE switches to, serving BS controller SRNC judges when being in released state, may further comprise the steps:
A, judge whether the presently used business of this UE comprises real time business, if, then obtain the QoS time delay limits value of described real time business correspondence, carry out next step; Otherwise the refusal migration, process ends;
B, obtain the actual transmissions time delay from SRNC to UE;
C, whether judge the actual transmissions time delay greater than described real time business QoS time delay limits value, if, then start migration, otherwise the refusal migration, process ends.
Wherein, this method further comprises: when the business that steps A is judged the current use of UE comprises a plurality of real time business, obtain the QoS time delay limits value of numerical value minimum.
Wherein, the step whether business of the current use of the described UE of judgement of steps A comprises real time business comprises: the business that reads the current use of UE when business initial is set up, be kept at this professional parameters/properties of SRNC, according to whether containing the properties/parameters that is designated real time business, judge whether to comprise real time business.The properties/parameters of described real time business is: speech business Conversational or flow professional Streaming.
Wherein, the described actual transmissions time delay of obtaining from SRNC to UE of step B comprises: obtain the processing delay of SRNC internal media access control MAC D, Access Layer processing delay and the SRNC of UE issues Frame Protocol FP issues FP by air interface to the base station node B that belongs to TRNC propagation delay time.
Wherein, the described SRNC of obtaining issues FP and comprises by the step that air interface issues the propagation delay time of FP to the base station node B that belongs to TRNC:
Moment RFN1 when a6, SRNC write down it and issue FP on SRNC sequential coordinate;
The moment CFN on the interface sequence coordinate aloft when b6, described NodeB write down it and issue FP by air interface;
C6, RFN1, CFN are transformed on the same sequential coordinate, be designated as SFN1, SFN2 respectively;
D6, calculating SRNC issue FP issues FP by air interface to described NodeB propagation delay time=SFN2-SFN1.Described SFN2-SFN1=
CFN+Frame_offset+chip_offset-RFN1-DiffBetweenRfnBfn+Tcel l; Wherein, DiffBetweenRfnBfn is the moment side-play amount of SRNC and described NodeB sequential coordinate, Tcell is the moment side-play amount of the sub-district sequential coordinate that switches to of described NodeB and UE, and Frame_offset, chip_offset are frame side-play amount and the sign indicating number side-play amount constantly constantly of the sequential coordinate of described air interface and described sub-district.
Wherein, the obtaining step of described DiffBetweenRfnBfn comprises: SRNC be recorded on the SRNC sequential coordinate, SRNC issues descendant node synchronization message T1 constantly; Described NodeB be recorded on the NodeB sequential coordinate, NodeB receives the moment T2 of described message and the moment T3 of NodeB reporting uplink node synchronization message; And place described upstream node synchronization message to send to SRNC T2, the T3; SRNC be recorded on the SRNC sequential coordinate, SRNC receives the moment T4 of the upstream node synchronization message of described NodeB; SRNC uses DiffBetweenRfnBfn=((T2-T1)-(T4-T3))/2 to calculate described DiffBetweenRfnBfn.
Wherein, after the described startup migration of step C, further comprise: SRNC is provided with a migration reason in the migration order that sends to TRNC; When TRNC receives the migration order that comprises this migration reason, accept the migration starting command.
By said method as can be seen, the moving method of RNC under the released state proposed by the invention, by the propagation delay time situation under the monitoring released state, QoS delay requirement according to the employed business of active user, only when the actual transmissions time delay does not satisfy current real time business QoS delay requirement, start the migration of RNC, be implemented under the QoS delay requirement that guarantees user's real time business, reduce the startup of RNC migration as far as possible.Thereby from the damage of having avoided meaningless migration to cause to the full extent, and the signaling traffic load that reduces RNC to business.
The present invention is particularly useful for the situation of UE back and forth movement between the NodeB of different RNCs control, has promptly guaranteed the QoS delay requirement of real time business, has avoided frequent starting RNC migration again.
Description of drawings
Fig. 1 is the cdma system networking diagram.
Fig. 2 is the SRNC judgement schematic diagram of moving out.
Fig. 3 concerns schematic diagram at the moment of SRNC, NodeB, sub-district, air interface.
Fig. 4 is the synchronizing process of SRNC to NodeB.
Fig. 5 is the DRNC judgement schematic diagram of moving into.
Embodiment
In mobile communication system, according to the difference that transmission delay is required, at present the business that mobile communication system provided is divided into four kinds of attributes, comprises: speech business (Conversational), stream professional (Streaming), interactive service (Interactive), background service (Background).In general, these four kinds of attribute business reduce successively to the requirement of propagation delay time.Wherein, Conversational and Streaming business have specific QoS propagation delay time restriction, are called real time business.When actual transmissions time-delay during greater than the QoS propagation delay time restriction of real time business, pausing can appear in the information that the UE side joint is received, discontinuous situation, and people's sense organ is easy to perceive, even is difficult to stand, and real time business comprises voice, video stream traffic etc.Interactive and Background business do not have specific propagation delay time restriction, are called non-real-time service.Non-real-time service has bigger time-delay or shake to be considered to reasonably, more requirements be the accuracy and the reliability of transfer of data, as data download, note transmission, E-mail etc.
According to the above four kinds of attribute business features, the present invention is when released state occurring, go to detect the employed business of active user and whether have real time business, when detecting when having real time business, the further actual transmissions time delay of signal calculated from SRNC to UE, compare with the QoS propagation delay time restriction of real time business, determine whether initiating migration.Only surpass the restriction of real time business QoS propagation delay time when the actual transmissions time delay, just initiate the migration of RNC, under the QoS quality requirement with the assurance real time business, avoid signaling traffic load that unnecessary migration brings and the damage of business.
For making purpose of the present invention, technical scheme and advantage clearer, below by specific embodiment with reference to accompanying drawing, the present invention is described in more detail.
The SRNC as shown in Figure 2 judgement schematic diagram of moving out may further comprise the steps:
The mobility of step 201～real-time monitoring UE of 202:SRNC detects UE when a sub-district switches to another sub-district, and SRNC judges the current released state that whether is in, if, then carry out next step, otherwise the refusal migration, process ends.
SRNC judges whether to be in released state, judge that promptly UE switches to another sub-district after, whether this UE also exists Radio Link with SRNC, when not having Radio Link, represents NodeB ownership and another RNC that this UE switches to, released state promptly occurred.
Step 203:SRNC reads presently used all the professional properties/parameters of this UE user, judges whether to comprise real time business, if, then read and write down the QoS transmission delay limits value of real time business correspondence, and carry out next step, otherwise the refusal migration, process ends.Be understood that if current when comprising a plurality of real time business, SRNC only need write down minimum QoS transmission delay limits value.
Introducing before SRNC judges whether to comprise real time business, the process set up of brief introduction business initial at first, comprise: initiate the foundation of certain business by CN, the properties/parameters that this is professional is handed down to RNC, RNC receives and stores described service attribute/parameter, according to service attribute/parameter, be this business configuration link circuit resource etc. then.Wherein, described service attribute/parameter comprises: service attribute Conversational/Streaming/Interactive/Background above-mentioned; Professional QoS propagation delay time limits value etc.
By certain professional process of setting up of above-mentioned brief introduction as can be seen, the SRNC side is preserved the properties/parameters of the employed miscellaneous service of having set up of current UE, therefore, when SRNC judges that UE is current and whether has real time business, SRNC reads each professional properties/parameters that current UE is being used, when judging that certain properties/parameters is Conversational or Streaming, then there is real time business.
Step 204～205:SRNC measures the actual transmissions time-delay of calculating current connection, and judges whether this time-delay surpasses the QoS propagation delay time restriction of the real time business of SRNC record in the step 203, if, then start migration, otherwise the refusal migration, process ends.
Wherein, the actual transmissions time delay comprises: the processing delay of SRNC internal media access control (MACD, MediumAccess Control), about 5ms; SRNC issues Frame Protocol (FP, Frame Protocol) issues FP by air interface to NodeB propagation delay time; Air interface can be ignored to the propagation delay time of UE; The Access Layer processing delay of UE, about 30-40ms.Wherein, the Access Layer processing delay of SRNC inside, UE is a fixed delay.SRNC issue FP to NodeB by the propagation delay time that air interface issues FP obtain/computational methods are as follows:
SRNC issues FP (FP, Frame Protocol) and constantly issues this FP time difference constantly to NodeB by air interface and be described propagation delay time.The moment of SRNC as shown in Figure 3, NodeB, sub-district, air interface concerns schematic diagram.Because SRNC, NodeB, sub-district, air interface are used the moment of sequential coordinate mark separately separately, therefore SRNC need be issued moment that the moment of FP and NodeB issue FP by air interface is converted on the same sequential coordinate and calculates, and thinking is as follows:
Step a, SRNC write down it and issue the moment RFN1 of FP on SRNC sequential coordinate;
Step b, NodeB report it by air interface moment CFN on the interface sequence coordinate aloft when UE issues FP;
Step c transforms to RFN1, CFN on the sequential coordinate of sub-district, is designated as SFN1, SFN2 respectively;
Steps d is calculated actual transmissions time delay=SFN2-SFN1.
Wherein, used following formula on the sequential coordinate that RFN1 is transformed to the sub-district that step c mentions:
RFN1+DiffBetweenRfnBfn=BFN1--------formula 1
BFN1=SFN1+Tcell--------formula 2
Wherein, following formula has been used in step c mentions CFN is transformed on the sequential coordinate of sub-district:
CFN+Frame_offset+chip_offset=SFN2--------formula 3
By formula 1～3, can derive the described actual transmissions time delay of steps d SFN2-SFN1 and be:
CFN+Frame_offset+chip_offset-RFN1-DiffBetweenRfnBfn+Tcell
Above-mentioned formula 1 is the moment conversion relation of SRNC and NodeB sequential coordinate, and DiffBetweenRfnBfn is the moment side-play amount of SRNC and NodeB, and BFN1 represents that RFN1 transforms to the value on the sequential coordinate of NodeB.The back has been described in detail the process of obtaining DiffBetweenRfnBfn.
Formula 3 is moment conversion relations of air interface and sub-district, is the conversion relation that the CDMA agreement provides, and wherein Frame_offset, chip_offset are frame, sign indicating number side-play amount constantly, can be regarded as the moment side-play amount of sub-district and air interface.Frame_offset, chip_offset can set up article one Radio Link (RL, Radio Link) the default DPCH side-play amount of the configuration of process (DOFF, Default DPCHOffset value) time, perhaps dispose automatically to generate and obtain by sub-district, air interface synchronizing process, specifically can be referring to the CDMA consensus standard, no longer good horse is stated herein.
Referring to the synchronizing process of the SRNC shown in Fig. 4, illustrate that SRNC obtains the process of DiffBetweenRfnBfn to NodeB.
In SRNC and NodeB synchronizing process, be handed down to NodeB descendant node synchronization message by SRNC, NodeB returns to SRNC upstream node synchronization message, can obtain the T1 shown in the figure, T2, four values of T3, T4.Wherein, T1 be illustrated on the SRNC sequential coordinate, SRNC issues the descendant node synchronization message constantly; T2 be illustrated on the NodeB sequential coordinate, NodeB receives moment of this message; T3 is illustrated in the moment on the NodeB sequential coordinate, NodeB reporting uplink node synchronization message; T4 is illustrated in the moment on the SRNC sequential coordinate, that SRNC receives the upstream node synchronization message of NodeB.Wherein, T1, T4 are by the SRNC record, and T2, T3 place the upstream node synchronization message of NodeB to carry to SRNC.SRNC utilizes this four moment, just can calculate the moment side-play amount DiffBetweenRfnBfn of SRNC and NodeB, to realize synchronously.Computational methods to DiffBetweenRfnBfn are introduced below:
Suppose a time point in office, the moment corresponding relation of BFN and RFN is: Tbfn=Trfn+X, BFN/Tbfn represents the moment value of NodeB sequential coordinate, and RFN/Trfn represents the moment value of SRNC sequential coordinate, and X represents the synchronous moment side-play amount DiffBetweenRfnBfn of RNC and NODEB.
Therefore, can obtain as figure: T2=T2 '+X, T3=T3 '+X does fortran then, obtains respectively:
T2 '=T2-X formula (1)
T3 '=T3-X formula (2)
Wherein, the propagation delay time from SRNC to NodeB, the propagation delay time from NodeB to SRNC can think equal, therefore obtain: T2 '-T1=T4-T3 ' formula (3)
Formula (1) (2) substitution (3) can be got: T2-X-T1=T4-T3+X.Do fortran, obtain: X=((T2-T1)-(T4-T3))/2, i.e. DiffBetweenRfnBfn value.
As seen from the above, at SRNC in the synchronizing process of NodeB, the DiffBetweenRfnBfn value that SRNC can obtain determining according to the T1 in the synchronizing process, T2, T3, T4.
When SRNC starts migration, in sending the corresponding signaling of TRNC to, a migration reason can be set be: Time Critical relocation.
And for the TRNC side, can realize moving into according to present moving method, comprising: at first judgement migration message has or not grammer or logic error, if correct, then TRNC accepts this migration, otherwise the remigration failure.After TRNC accepted migration, TRNC distributed the resource of moving into, if TRNC side resource allocation failure or other reason can not be moved remigration failed message then, and point out failure cause; Otherwise return the success message of moving into.
By above strategy, the present invention is by monitoring separate users as can be seen, only migration is initiated in time-delay when the actual time delay of business is discontented with sufficient qos requirement, on the service delay basis that guarantees the user, from the damage to business of having avoided meaningless migration to cause to the full extent.
Be understood that though embodiment is to be that example describes with the cdma network, because Cellular Networks has identical principle, so the present invention also can be applicable in the common Cellular Networks.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1, a kind of base station controller RNC moving method under released state, the sub-district that user terminal UE switches to belongs to target base station controller TRNC, serving BS controller SRNC judges when being in released state, it is characterized in that, this method may further comprise the steps:
A, judge whether the presently used business of this UE comprises real time business, if, then obtain the QoS time delay limits value of described real time business correspondence, carry out next step; Otherwise the refusal migration, process ends;
B, obtain the actual transmissions time delay from SRNC to UE;
C, whether judge the actual transmissions time delay greater than described real time business QoS time delay limits value, if, then start migration, otherwise the refusal migration, process ends.
2, method according to claim 1 is characterized in that, this method further comprises: when the business that steps A is judged the current use of UE comprises a plurality of real time business, obtain the QoS time delay limits value of numerical value minimum.
3, method according to claim 1 is characterized in that, the step whether business of the current use of the described UE of judgement of steps A comprises real time business comprises:
The business that reads the current use of UE when business initial is set up, be kept at this professional parameters/properties of SRNC, according to whether containing the properties/parameters that is designated real time business, judge whether to comprise real time business.
4, method according to claim 3 is characterized in that, the properties/parameters of described real time business is: speech business Conversational or flow professional Streaming.
5, method according to claim 1 is characterized in that, the described actual transmissions time delay of obtaining from SRNC to UE of step B comprises:
Obtain SRNC internal media access control MAC D processing delay, UE the Access Layer processing delay and
SRNC issues Frame Protocol FP issues FP by air interface to the base station node B that belongs to TRNC propagation delay time.
6, method according to claim 5 is characterized in that, the described SRNC of obtaining issues FP and comprises by the step that air interface issues the propagation delay time of FP to the base station node B that belongs to TRNC:
Moment RFN1 when a6, SRNC write down it and issue FP on SRNC sequential coordinate;
The moment CFN on the interface sequence coordinate aloft when b6, described NodeB write down it and issue FP by air interface;
C6, RFN1, CFN are transformed on the same sequential coordinate, be designated as SFN1, SFN2 respectively;
D6, calculating SRNC issue FP issues FP by air interface to described NodeB propagation delay time=SFN2-SFN1.
7, method according to claim 6 is characterized in that, described SFN2-SFN1=CFN+Frame_offset+chip_offset-RFN1-DiffBetweenR fnBfn+Tcell;
Wherein, DiffBetweenRfnBfn is the moment side-play amount of SRNC and described NodeB sequential coordinate, Tcell is the moment side-play amount of the sub-district sequential coordinate that switches to of described NodeB and UE, and Frame_offset, chip_offset are frame side-play amount and the sign indicating number side-play amount constantly constantly of the sequential coordinate of described air interface and described sub-district.
8, method according to claim 7 is characterized in that, the obtaining step of described DiffBetweenRfnBfn comprises:
SRNC be recorded on the SRNC sequential coordinate, SRNC issues descendant node synchronization message T1 constantly;
Described NodeB be recorded on the NodeB sequential coordinate, NodeB receives the moment T2 of described message and the moment T3 of NodeB reporting uplink node synchronization message; And place described upstream node synchronization message to send to SRNC T2, the T3;
SRNC be recorded on the SRNC sequential coordinate, SRNC receives the moment T4 of the upstream node synchronization message of described NodeB;
SRNC uses DiffBetweenRfnBfn=((T2-T1)-(T4-T3))/2 to calculate described DiffBetweenRfnBfn.
9, method according to claim 1 is characterized in that, after the described startup migration of step C, further comprise: SRNC is provided with a migration reason in the migration order that sends to TRNC; When TRNC receives the migration order that comprises this migration reason, accept the migration starting command.
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| FI108772B (en) * | 1998-03-31 | 2002-03-15 | Nokia Corp | Method for managing mobile connection |
| EP1128685B1 (en) * | 2000-02-22 | 2006-08-30 | Lucent Technologies Inc. | Method for handover of real-time calls in wireless communication systems |
| CN1184763C (en) * | 2001-12-05 | 2005-01-12 | 华为技术有限公司 | Method for optimizing transmission resource in CDMA system |
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Granted publication date: 20080227 Termination date: 20200923 |